I. Symptoms: Tomato root-knot nematode disease mainly damages the roots of plants, and occurs mostly on fibrous roots or lateral roots. It causes swollen and deformed roots and is chicken-shaped. The roots of the nematode nematodes can be found buried in it. The upper part of the plant showed poor development, yellow leaves and short plants. The results were small and small, yield was low, and the quality was poor. When drought occurs, diseased plants tend to wilt until the pruning plants die. Second, the incidence of the law: the pathogen is a southern root-knot nematode, with 2 - 3 instar larvae or eggs with the disease in the soil in the winter, through the soil, sick, diseased seedlings spread with fertilization, irrigation and agricultural operations. Root-knot nematodes generally endanger more than 30 centimeters of soil, and are most distributed in 5-20 centimeters of soil. In the terrain with high dryness, loose soil, suitable humidity and low salinity, the damage is serious. Many years of continuous cropping has been seriously affected. According to the survey, the origin of root-knot nematode infection in tomato roots in Angezhuang Town of this county may be the nursery soil of peanut field. Third, control methods: To control the occurrence of pathogens in protected areas, to reduce the first time the source of field dip, take agricultural measures to prevent and control, combined with the necessary chemical control. (a), agricultural control: 1, with disease-free soil seedlings, the application of pathogen-free organic fertilizer as a base fertilizer, and the selection of disease-free seedling colonization; 2, completely remove the diseased body: the sick body after harvest clean, especially Tomato root, bring out the rural concentrated burned; 3, deep turning the soil: the topsoil deep to less than 20 cm, can reduce the source of initial infusion; 4, rotation: serious disease fields and gramineous crops or with onions, garlic, leeks and other crop rotation 2-3 years, it is best to plant 1 rice; 5, the use of high temperature to kill nematodes: greenhouses in the summer season can be used in summer heat, digging furrows in summer, ridge irrigation, ridge cover mulch, and closed shed Room more than 15 days, so that 30 cm soil temperature reached 54 °C above, keep more than 50 minutes, can kill most of the nematodes; (b), chemical control: 1, soil treatment: before sowing or 15 days before planting, selection 10% Limanku, 50% Yishuning, 3% Milur and other granules 3-5 kg ​​mixed soil after deep turning; Before planting with 1.8% Insect grams or 6.73% Awei insect clear, 1 liter amount of acres , Duishui 5000-6000 times liquid, ditch or hole application, and then seal ridge, 1 month later In the irrigation time, valid for up to 20 days, the control efficiency of 90%. 2. Pharmaceutical Irrigation: After planting, when the plants in the shed are partially damaged, 50% phoxim EC can be used to irrigate the roots, 0.25-0.5 kg per plant, and the soil kills the root-knot nematodes in the soil. .
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